Drilling apparatus



DRLLING APPARATUS Filed Jan. 25,- 1927 4 Sheets-Sheet 1 O fh Inventortto r11 @y 1,688,774 B.T. NFIELD DBILLING APPARATUS Oct. 23, 1928.

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B. T. ANFIELD DRILLING APPARATUS Filed Jan. 25, 1927 4 sheets-sheet 4.Nm H W Vm NN\m\h-:-:-.w L J T. 1, l l l UN ,m l.. y m m f NN. O O C mw...l 11. 1] 11.. WIW /\O]\ E E E n CL CL Mm NIW E .If l

Patented 23,

'UNTED STATES' BENJAIVIIN T. ANEIELD, OF BOULDER, COLORADO.

DRILLING APPARATUS.

Application led January 25, 192'?.

This invention relates to an improved drill ing apparatus adaptedespecially to operate as a coal or rock drill, and it has moreparticular reference to a structure of this character which includes adrill carrying screw and an electric motor drive therefor.

An important feature of the improved structure is a novel differentialfeed device including a longitudinally movable drill carrying screw.

Another feature of construction is a sectional bushing employed foroperating the screw and associated with means controlled by a brake barfor opening and closing the sections of the bushing to allow positivefeedi ing of the screw or free adjusting movement as may be desired.

Another feature of construction is the compact and convenient motordrive including a controlling clutch.

A further feature of construction, is the novel supportingdevice whichincludes a frame and an adjustably mounten carriage upon which the drillproper is rockably mounted.

Other structural features and advantages of the invention will becomeapparent from the following description and drawings.

In the accompanying drawings forming a part of this application and inwhich like numerals are employed to designate like parts throughout thesame Figure 1 is a longitudinal section through a drill constructed inaccordance with the invention.

Figs. 2., 3 and l are cross sections taken approximately upon the planesof the lines 2-2, 3 3, and M11 of Fig. 1.

Fig. 5 is a perspective view of one of the details.

Fig. 6 is a fragmentary perspective view of a portion of one of the feedbushing seo tions.

Fig. 7 is a view showing the supporting frame structure.

Fig. 8 is a fragmentary view of the same structure showing` thearrangement of details more plainly.

Fig. 9 is a perspective view of a part which coopera-tes with the partsshown in Fig. 5.

Fig. 10 is a side elevation of the complete structure. showing theexternal configuration thereof.

- the desired ratio.

Serial No, 163,436.

Fig. 11 is a view like Fig. l, showing the sections of the bushingdisengaged from the drill screw.

Fig. 12 is a perspective view of the nut operating` gear.

Referring first to Fig. 10, it will be seen that the referencecharacter' 1 designates the casing of a suitable relectric motor,associated with an appropriately constructed housing for the mechanismwhich includes the central section 2, a right hand end section 3, and asimilar left hand end section 4. Carried by, and extending outwardlyfrom the center' of the central section 2 are supporting pintles 5 whichserve a purpose to be hereinafter described.

Referring now to Fig. 1, it will be seen that the electric motor shaftis designated by the reference character 6,v and that it serves to drivetwo separate gear trains. The left hand train comprises a relatively,large gear 7 in mesh with vthe rotatably mounted idler 8, which is inturn in mesh with a clutch gear 9. The remaining train ycomprises a gear1() meshing with a relatively small idler' 11, which in turn is in meshwith a. comparatively large gear 12.

All of these gears are of a size to provide Y As before indicated, thegear 9 has operating connection with a normally closed clutch generallyindicated by the reference character 13. This clutch includes operatingpin-s 14 .connected to a slidably mounted disk 15 operated by a similarand slidably mounted plate 16. Coiled springs 18 surround the pins 14and bear at one end against an outstanding flange carried by a rotatablymounted sleeve 19.

This sleeve 19 is provided with internal keys 20 having drivingconnection with the multiple screw 21. As before stated, this screwcarries the drill l(not shown). It will be. noticed in connection withthe parts .under consideration7 that a suitable thru-st bearingincluding antrfriction balls is interposed between the outstandingflange and the clutch and driving gear. Moreover, the tension of thesprings 18 issuch as to maintain the clutch normally closed. For thepurpose of disengaging the clutch7 1 provide an operating frame 22 ofthe construction shown in 2, this being pvotally mounted on thedepending lugs 23 on the easing ucture and including handle 24.9 ,by

V26 or 27 as shown better in Fig. 1.

The opposite ends ot these rods connect with a ring 28 (see Fig. 9),which is journaled for rotation in the casing section 3 as representedin Fig. 1. VIn this connection, it will be noticed that the feed bushingwhich has screw threaded connection with the screw 21 is interposedbetween the hub of the gear 12 and the inner side oif the rotataliilering 28. Also the rods 26 and 2? provide a driving Connection wherebyall ci these parts are rotated as aunit. Since the gears 10, 11 and 12serve to drive the bushingl and as they are of dil'erent proportionswith respect to the gearing train including the gears 7, 8 and 9, it isobvious that the screw 21 rotates at one speed and the bushing at adifferent speed, providing a differential action, thus causing the drillwhich is on the screw, to enter the work for boring in the customarymanner, while simultaneously fed against the work, as the hole is bored.

As before stated, novel means is provided whereby the sections ot thebushing may be disengaged from the feed screw. For instance, as shown inFig. 4, these sections are engaged with the screw to produce theaforesaid differential operation. In Fig. 11, however, the sections 11are swung away and disengaged iirom the screw to allow free rotation.The means under consideration comprises a brake. bar 3() (see Fig. 1),which is movably mounted in the lugs 31 and which is operated by amanually rotated bolt 32.

This bar serves to engage a pair of annular bands 33 and 34, the firstnamed of which surrounds the hub of the gear while the second one ofwhich surrounds the aeriphery of the ring 28. In connection with thelatter element, it will be noticed that this is provided with a pair oi.segmental proj ect-ions 35 spaced apart and adapted to receivetherebetween th'e sectors 36 carried by the band 34. In this'connection, it is to be stated that the hub of the gear 12 is alsoprovided with a pocket for reception of the corresponding sectorscarried by the band 33. This arrangement allows the band to be shiftedwith respectto the parts on which they are mounted. vided with camgrooves 37 for reception. of operating lingers 38 of angularconstruction carried by the section 25 of the bushing.

In each instance, the sectors 36 are prothe closed position representedin Fig. 4 to the open position represented in Fig. 11, due to the camconnections of the fingers 38 in the cam grooves 37 in the sectors 3G,(see Fig. 4 in particular). Y

In this connection, it will be noticed that the aforesaid pins 26 and 27are surrounded by coiled springs 39 provided at one end with smalltubular anchors 40 (see Fig. 6), which are provided with teeth inengagement with I serrations 41 provided on the aforesaid sectors 35,(see Fig. 9 and Fig. 1) The opposite ends of the springs bear upon thesections of the bushing as represented in Fig. 4, for the purpose otclosing these sections, and maintaining them in closed relationship.Whenever it is desired to tension the spring, this is done by turningthe anchors 40 in an obvious manner.

Confining attention now more particularly to Figs. 7 and 8 it will beseen that a supporting structure for the drill is here shown, and thisincludes a stationary frame 43 of vertically elongated form having anextensible anchor 44 at the bottom and the stationary anchoringprojection 45 at the-top. A carrier 46 is slidably mounted on thisframe, and is adjusted up or down thru the medium of the intermeshingGears 47 and 48, the crank handle 49,`the racIz teeth 50, and pawl andratchet mechanism.

As shown better in Fig. 8, the top structure of this slidable carrier isformed with opposite seats 51 rotatably receiving the diametricallyopposite pintles 5 carried by the centralportion of the drill housing.This allows the entire drill to be rocked about the pintles and to beelevated up or down to the desired plane of operation. In order to holdit in various inclined positions, or level, as desired, I provide alever 52 pivotally mounted on the housing carrying a binding shoe 53.Operating in conjunction with the levers 52 is a U shaped yoke 54 whichis adjusted through the medium of a nut 55 mounted on a screw threadedstem 56 depending from the sections 4 of the housing.

The structure alsoV includes appropriate en- Y closures for the gearingas well Vas switch' boxes and wiring for the motor.

From the foregoing description, it is obvious that when the motor shaft-6 is set into rotation, the two separate gearing trains operate throughdifferent ratios to drive the sleeve 19 and its screw 21 at one speed,and

the split bushing at a different speed. Thus while the drill is boring,it is automatically ed at a desirable speed against the work to insure acontinuous boring operation.

It is believed that by considering the description in connection withthe drawings, a clear understanding of the construction and operationor' the drill, aswell as the supporting, adjusting and retaining means,will be understood. In view of this, a more lengthy description isthought unnecessary.

Minor changes in the shape, size and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the appended claims.

Having thus described my invention, what I claiin as new is l. In astructure of the class described,a casing, gearing train including agear provided with an outstanding central hub, a ring rotatably mountedin said casing and spaced rom' said hub, a split bushing interposedbet-ween said ring and hub, a drill screw extending thru the said gear,bushing and ring', said bushing being provided with screw threadsconnected with the threads of said screw, connecting pins between thering and hub of said gear, the sections of said bushing being rockablymounted on said pins.

2. In astructure of the class described, a casing, gearing trainincluding a gear provided with an outstanding central hub, a ringrotatably mounted in said casing and spaced 'from said hub, a splitbushing interposed between said ring and hub, a drill screw extendingthru the said gear, bushing and ring, said bushing being provided withscrew threads connected with the threads of said screw, connecting pinsbetween the ring and hub of said gear, the sections of said bushingbeing rockably mounted on said pins, annular bands surrounding the huband ring respectively, said bands being provided with inwardly directedsectors provided with cam grooves, and cam lingers on the ends of thesections ot the bushing in said grooves, together with means fortemporarily holding said bands against rotation, to bring about a camoperation for disengaging the sections of the bushing from the threadsof the screw.

In testimony whereof I aiIiX my signature.

BENJAMIN T. ANFIELD.

